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morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

Hey everyone. How would one estimate the life of an external fuel pump?
I need to know if i should buy a new one or not yet.
Its kindof loud and reved but this is because the insulation in the boot area is out...the rpm of it changes slightly at idle but then again my idle is 500-600 RPM and the voltage supplied could not be very steady(+ the alternator belt is crap).
The car pulls strong and there is no sign of detonation or it going lean.

any toughts ?
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Stampedetrail · Joined: 29 May 2005 Posts: 274 Location: Fairbanks, Alaska

Uh, fix the alternator belt?
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1977.5 924 "Martini" head / New Old Stock rebuild
1985.5 944 Why? Because I can.

Rich H · Posted: Tue Apr 22, 2008 8:23 pm Post subject:

When it tops pumping fuel its time for a new one...

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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

yea well if it stops pumping fuel 2000 miles from home at 22:00 PM on a highway...thats not a good thing.

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RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

My original 77 vintage 984 Bosch pump was still working although noisy when I replaced it with a new one for reliability. Big mistake. The old one was made in Germany and the new one was European (cant recall where now, but NOT German). The new one was actually noisier and only lasted 2 years. POS

So had to put the old one back in until I got a new Pierburg that appears to be working very well and much quieter.

So life expectancy is somewhere between 1 and over 30 years.

Smoothie and others have been happily running Pierburgs for some years now. They may still be cheap at Rock Auto.

Roger

Paul · Posted: Wed Apr 23, 2008 11:04 am Post subject:

The key to long life for one of these pumps is to use it often and keep water out of the fuel.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

hah...for this price for the fuel if there is just a sip of water in a 1000 liter tank i'll sue them !
No water in the tank for me....but i've noticed that the pump RPM fluctuates at idle and that worries me that it might let go on the highway.
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Nobbi · Joined: 24 Aug 2006 Posts: 1396 Location: Germany

My one makes funny noises since 20 years, but keep on pumping........
fingers crossed!!!

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NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1967

Vince Ponz · Joined: 02 Nov 2002 Posts: 3581 Location: Florida

Extend the life of the pump. Every year of so run the gas down to a couple of gallons and drain the tank and clean the pump. Backflush the pump gently.
The cars are old and rust accummulates in the tank and therefore the pump.
Ask me how I know.

I removed mine and took out a cup full of rust.

When you remove the pump you should flush the tank by running the gas you removed a couple of times to clean out the rust. When clear replace pump.
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

hey Vince, thanks for the tip.
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